Study design
A prospective cohort study was conducted from November 2014 to April
2017 at the 2nd Department of Pediatrics of the
National and Kapodistrian University of Athens at the “P. & A.
Kyriakou” Children’s Hospital. The study protocol was approved by the
Hospital’s Ethics Committee prior to its initiation (approval number
14445/22-10-2015). Parental informed written consent was obtained prior
to enrollment.